-LRB- CNN -RRB- -- Jerome Kerviel , the man behind France 's biggest rogue-trading scandal , lost his appeal Wednesday against his prison sentence for betting â ‚ ¬ 50 billion -LRB- about $ 65 billion -RRB- of a French bank 's money without its knowledge .

The Paris court upheld the five-year sentence with two years suspended that was handed down in October 2010 , Kerviel 's lawyer , David Koubbi , said . The ruling means Kerviel will serve three years in prison .

The ruling that Kerviel must pay â ‚ ¬ 4.9 billion -LRB- about $ 6.3 billion -RRB- in damages to the bank , Societe Generale , was also upheld .

`` We had set ourselves the objective of defending Mr. Kerviel against an injustice that is absolutely lamentable , '' Koubbi said outside the courthouse , according to CNN affiliate BFM-TV . `` We will continue to support Mr Kerviel in his fight . ''

Koubbi said the legal team would consider the possibility of an appeal in France 's court of final appeal , the Cour de Cassation .

Jean Veil , a lawyer for Societe Generale , told BFM-TV that he had `` great satisfaction regarding the court 's decision to name Jerome Kerviel as solely responsible for the fraud . ''

The bank was pleased with the original conviction because it placed responsibility for the rogue trades on Kerviel and not the bank . If Kerviel 's conviction were overturned , it could once more raise questions about the bank 's role in the scandal .

The bank had previously indicated it might not require Kerviel to pay the damages , as it would be an impossible sum to shell out even in multiple lifetimes .

The former Societe Generale employee went on trial in June 2010 on charges of forgery , breach of trust and unauthorized computer use . The banks says the unhedged bets cost it almost $ 6 billion .

Kerviel had pleaded guilty to the charge of computer abuse , but his attorney at the time , Olivier Metzner , had asked jurors in his closing arguments to acquit his client of the charges of breach of trust and forgery .

Metzner previously told CNN that Kerviel 's behavior was strongly influenced by the environment at Societe Generale . `` The banks are the ones to blame for the banking system and the systematic economic crisis , not Jerome Kerviel , '' he said .

Metzner filed the appeal against the sentence , but Kerviel switched to Koubbi as his attorney in March this year .

Koubbi lamented that `` despite the new elements added to his defense , '' Kerviel 's appeal had failed .

Kerviel traded European index futures for the bank . He was the only person ever charged in the case , despite claiming he did everything with the knowledge of his superiors .

`` I am convinced the criminal file is full of elements proving that my superiors knew and covered for me . At least I should n't be the only one in the dock , '' he told CNN after the release of his memoirs , `` Trapped in a Spiral : Memoirs of a Trader , '' in which he pleads his innocence .

`` These managers earned colossal amounts of money out of bonuses based on the ever-growing results that I was making for the bank , '' he said .

Societe Generale , which said it discovered the losses in January 2008 , said that at no time were supervisors aware of Kerviel 's alleged unlawful activities .

CNN 's Dheepthi Namasivayam , Sybile Penhirin and Pierre Meilhan contributed to this report .

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NEW : Societe Generale says it has `` great satisfaction '' regarding the court 's decision

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NEW : A lawyer for Jerome Kerviel says he is considering a final appeal

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The court upholds the original sentence , sending Kerviel to prison for three years

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The former employee traded $ 65 billion for nearly $ 6 billion in losses